There's a couple of things it could be. The shifter handle could be loose on the stick. There's a little door on the front of the shifter handle. Pry it open and then try tightening the screw behind the door. Use a Torx T-20 bit.

If that doesn't stop the rattling, then remove the screw completely and pull off the handle. Underneath, you will see a steel stick and with a plastic plunger rod in the middle. This plastic plunger rod could be vibrating against the steel stick while the vehicle is in drive or M. A dab of thick grease between the stick and plunger rod should be enough to get the rod to stop moving around (although you may have to do it again in the future if the grease wears out).

There's a couple of things it could be. The shifter handle could be loose on the stick. There's a little door on the front of the shifter handle. Pry it open and then try tightening the screw behind the door. Use a Torx T-20 bit.

If that doesn't stop the rattling, then remove the screw completely and pull off the handle. Underneath, you will see a steel stick and with a plastic plunger rod in the middle. This plastic plunger rod could be vibrating against the steel stick while the vehicle is in drive or M. A dab of thick grease between the stick and plunger rod should be enough to get the rod to stop moving around (although you may have to do it again in the future if the grease wears out).

The more I think about it - the more I think it is the black plastic center slider as jtzako had mentioned above. This slider runs in a track and we noticed a lot of gap between the shifter cover and white plastic track under it. This gives a lot of room for the black plastic slider to vibrate in certain positions. When we made the Hurst automatic shifter plate we tightened this up by more firmly sandwiching the black plastic slider to prevent any buzzing or rattle.

There are a few things that can be done if you don't have the Hurst plate. I would suggest removing the handle then top plate of the shifter to access the black plastic slider (I've attached the Hurst instructions on how to do this). In steps 12 & 13 it shows the black plastic slider. Take the slider and roll it up (rib side in) tightly. This will put "set" into the slider and it should act more like a spring, creating some resistance against vibration. If this doesn't work, then the next step would be putting small strips of Dynamat between the ribs of the slider.

Note- if this doesn't fix the problem then, it's very likely that the shifter isn't the problem. You may have vibration in the transmission or other parts of the vehicle that are getting transmitted up through the shifter.

I know exactly what you are talking about. Mine was rattling badly in D and worse in M. If I held it firmly and pulled back it stopped. Took it in to the dealer and they replaced the entire assembly. Ran with it for 3-4 months with no more noise before I installed the pistolgrip tapshifter.

I know exactly what you are talking about. Mine was rattling badly in D and worse in M. If I held it firmly and pulled back it stopped. Took it in to the dealer and they replaced the entire assembly. Ran with it for 3-4 months with no more noise before I installed the pistolgrip tapshifter.

This is probably the besst way, unfortunately. How are you liking the tapshifter? Which one did you go with?